Software Testing: extreme programming

What is extreme programming? What are its characteristics?

Extreme Programming (XP) is currently one of the most well-known agile development life cycle models. (See [Agile] for ideas behind this approach.) The methodology claims to be more human friendly than traditional development methods.

Some characteristics of XP are:

• It promotes the generation of business stories to define the functionality.

• It demands an on-site customer for continual feedback and to define and carry out functional acceptance testing.

• It promotes pair programming and shared code ownership amongst the developers.

• It states that component test scripts shall be written before the code is written and that those tests should be automated.

• It states that integration and testing of the code shall happen several times a day.

• It states that we always implement the simplest solution to meet today’s problems.

With XP there are numerous iterations each requiring testing. XP developers write every test case they can think of and automate them. Every time a change is made in the code it is component tested and then integrated with the existing code, which is then fully integration- tested using the full set of test cases. This gives continuous integration, by which we mean that changes are incorporated continuously into the software build. At the same time, all test cases must be running at 100% meaning that all the test cases that have been identified and automated are executed and pass. XP is not about doing extreme activities during the development process, it is about doing known vague-adding activities in an extreme manner

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